Synchronizing Location Trigger Information in SUPL Networks
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Solution Overview
Problem
The existing location trigger information synchronization between Secure User-Plane Location (SUPL) Enabled Terminals (SET) and network-side location devices is often out of sync due to changes in user identity or loss of location trigger information, leading to disruptions in location services, especially during user identity changes or SIM card swaps.
Innovation Solution
A method and device for synchronizing location trigger information, where the network-side location device stores user identifier and location trigger information, and the SET actively requests synchronization at intervals or upon trigger conditions, ensuring consistent information storage on both the SET and the network-side device, thereby maintaining normal location process progress and improving success ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the SET stores location trigger information locally, then the location process can proceed autonomously, but the information becomes out of sync when user identity changes or information is lost
Solution Approach 1:
The network-side location device pre-stores location trigger information associated with user identifiers. When a SET provides a user identifier, the network device can immediately provide the corresponding pre-stored trigger information without requiring real-time generation or complex synchronization protocols.
Solution Approach 2:
The SET obtains location trigger information by copying it from the network-side location device. The network device stores multiple copies of trigger information associated with different user identifiers, allowing the SET to retrieve and use a copy without affecting the original stored in the network.
2Reliability
If the network stores location trigger information for each user, then information can be retrieved after identity changes, but the storage and management complexity increases
Solution Approach 1:
The location trigger information is segmented by user identifier, with the network-side location device maintaining separate associations between user identifiers and their corresponding trigger information. This segmentation allows efficient retrieval based on user identity without requiring complex global management structures.
Solution Approach 2:
The network-side location device preliminarily establishes and stores the mappings between user identifiers and location trigger information before they are needed. This preliminary preparation eliminates the need for complex real-time generation or negotiation during location operations.
3Reliability
If the SET actively requests synchronization at intervals, then information remains current, but the communication overhead and processing time increase
Solution Approach 1:
The SET performs periodic synchronization by actively requesting location trigger information from the network-side location device at predetermined intervals. This periodic action ensures information remains current while allowing the system to enter low-activity states between synchronization events, reducing overall communication overhead.
Data Source
AI summary
A method for synchronizing location trigger information, a location device, and a Secure User-Plane Location (SUPL)-Enabled Terminal (SET) includes: receiving a request for synchronizing location trigger information from a location User Equipment (UE), where the request carries the user identifier information of the user; from the correspondingly stored user identifier information and location trigger information, obtaining the location trigger information corresponding to the user identifier information of the location user; and generating a response message that carries the obtained location trigger information and sending the response message to the location UE.